Method of and composition for the protection of grain



UNITED STATES PATENT OFFICE METHOD OF AND COMPOSITION FOR THE PROTECTION OF GRAIN Elemer Klein, Tel-Aviv, Israel No Drawing. Application January 29, 1952, Serial No. 268,920

Claims. (Cl. 99-153) 2 This invention concerns the protection of mineral flour can be removed easily by sifting, stored Wheat and other grain, airelutriation or in any other suitable Way.

One of the most dangerous pests for stored I a m: grain is the weevil (CaIandra, especially C. gran- 1. A mixture adapted to be stored and to resist aria) which works ravages up to 2% yearly. In 5 spoiling by weevi s, including cereal grain nd addition to the actual destruction of grain, the from 1 to 4% by Weight of heat-expanded per- (Tribolium, especially Tr. ferrugz'neum). 3. A method as claimed in claim 2, wherein the It is known that some kinds of glassy volcanic 2g proportion of mineral flour is from 1 to 4% by rock, e. g. perlite, can be made to expand, by care- Weight of the mixture.

ful heating to high temperatures, to a light- 4. Amethod of preparing cereal grain for storweight cellular material to times the orig age comprising admixture to the grain from 1 inal volume. A similar property is possessed by to 4% by weight of the mixture of heat-expanded grinding the aforesaid lightweight material to more than 2% residue. a degree of fineness so that it passes through 5. A mixture adapted to be stored and to resist sieves from about 5,000 to 10,000 meshes per sq. spoilins y w v ls, in ud r al rain and and fiour beetles are extirpated by the consumpper square centimeter without leaving on the tion of the mineral flour. The deadly effect of sieve more than 2% residue.

ELEMER KLEIN.

of the gastro-intestinal tracts, as the pests can References Cited in the file of this Patent neither digest the mineral flour nor excrete it UNITED STATES PATENTS for the fact that the bad smell otherwise pro- 2 2 2 6 g gg z duced by weevils in g1 ain stores attacked by them n I does not occur in grain protected in accordance OTHER REFERENCES with this invention. A Simple Method of Protecting Cereals and A suitable proportion of the mineral flour in Other stored Foodstuffs Against Insect Pests, by its mixture with the grain is of the order of, for Kitchener et al., Chemistry and Industry, Janexample, 1 to 4% by weight. uary 23, 1943, pages 32 and 33.

When the grain is removed from the store the 543 

1. A MIXTURE ADAPTED TO BE STORED AND TO RESIST SPOILING BY WEEVILS, INCLUDING CEREAL GRAIN AND FROM 1 TO 4% BY WEIGHT OF HEAT-EXPANDED PERLITE GROUND INTO A FLOUR OF A FINENESS SUCH AS TO PASS THROUGH A SIEVE OF FROM 5,000 TO 10,000 MESHES PER SQUARE CENTIMETER WITHOUT LEAVING ON THE SIEVE MORE THAN 2% RESIDUE. 